JP4018828B2 - Leap-type steel patrol bridge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
For example, the present invention provides a snowfall countermeasure suitable for use in periodic inspections of power transmission towers installed in mountainous areas with a large amount of snow in winter, and is designed to be installed by human power alone. It relates to the upper steel patrol bridge.
[0002]
[Prior art]
Many of the existing patrol bridges were simply handed over thinned logs to the valleys.
In some cases, full-scale steel patrol bridges are also constructed.
[0003]
[Problems to be solved by the invention]
As mentioned above, the installation cost can be kept low enough, but not only is the footsteps unstable and difficult to walk, but it also becomes slippery when it is raining or snowing. Is particularly dangerous.
In addition, corrosion progresses year by year and the durability is poor, and there is a risk of falling if the corrosion is not noticed.
[0004]
On the other hand, the steel patrol bridge is quite expensive, but it has almost satisfactory durability, and there is no problem in safety.
However, since steel bridges are considerably heavy, a crane is required for installation on site, and much labor and expenditure are required for construction work in mountainous areas. And of course, there are many places where cranes cannot be carried.
Furthermore, in areas where there is a large amount of snow, a large snow load is applied on the bridge, so if it is made strong enough to withstand it, not only will the bridge work become more difficult, but the cost will increase.
[0005]
Accordingly, an object of the present invention is to provide a leap-type steel patrol bridge that adopts a split / assembled structure that takes measures against snow accumulation, has a light and simple configuration as much as possible, and can be installed only by human power without depending on heavy machinery In offer.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the jumping steel patrol bridge according to the present invention is
A bridge girder unit A in which a plurality of vertical girder members and cross girder members are connected in a rectangular frame shape,
A walking board unit B having a size that can be placed on top of the bridge girder unit A;
A hinge portion C for connecting the side end of the walking board unit B to the side end of the bridge girder unit A so as to be able to stand up and down;
A fixing means D for fixing the standing state is provided.
And the walking board unit B is good to set it as the structure which stretched the net | network or the grid | lattice-like tread on the rectangular frame.
Also, as the fixing means D, the base end side is pin-connected to the side end of the walking board unit B, and the hook portion is provided at the distal end portion to be engaged with the handrail E standing on the side end of the bridge girder unit A. It is recommended to use a fastener.
The bridge girder unit A assembled with the walking board unit B is prepared so that it becomes a patrol bridge of a required length by preparing a plurality of types with different lengths and connecting them appropriately in combination. Good.
Each bridge girder unit A may be detachably assembled with a plurality of walking board units B in tandem.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a leap-type steel patrol bridge (hereinafter simply referred to as a patrol bridge) of this embodiment in a state where a walking board unit is flipped up in preparation for snow accumulation. The rightmost walking board unit is left without being flipped up.
[0008]
In the schematic configuration of the illustrated patrol bridge, three bridge girder units A having different lengths are connected in a column to assemble a bridge girder having a desired length.
Depending on the length of each bridge girder unit A, each side end of two or three walking board units B is connected via a hinge part C so as to be able to stand up and down.
A handrail E is erected on one side end of each bridge girder unit A.
Furthermore, each walking board unit B is provided with a fixing means D (see FIG. 6) for fixing the standing state.
[0009]
The bridge girder unit A shown in FIG. 2 and FIG. 3 includes two vertical girder members 1 and 1 having a predetermined length arranged in parallel at a predetermined interval and arranged at an appropriate interval. It has a configuration in which the five horizontal beams 2 and 3 are connected in a rectangular frame shape.
In this bridge girder unit A, two walking board units B are assembled in a column. Therefore, each pair of pin insertion fittings 4a constituting one half of the hinge portion C is projected on a total of four locations on the upper surface of one stringer 1.
[0010]
As shown in FIG. 3 and FIG. 4, on one stringer 1, columns 5 constituting handrails E are erected at two locations near both ends thereof.
A handrail bar 6 made of pipe is installed between the support columns 5 and 5. The handrail E is assembled and attached by bolting.
Bolt holes 7 for connecting the bridge girder units A are provided at both ends of each stringer 1.
[0011]
Next, as shown in FIGS. 5 and 6, the walking board unit B has a configuration in which a net-like step board 22 is stretched on the upper surface of the rectangular frame 21. The rectangular frame 21 is appropriately provided with reinforcing bones 21a.
The tread 22 in this case is made by providing a number of cuts in the steel plate and then expanding it.
Then, one set of pin insertion fittings 4b constituting the other half of the hinge portion C is projected at two locations facing the pin insertion fitting 4a at one edge in the longitudinal direction of the rectangular frame 21. ing.
[0012]
Further, as shown in FIG. 6, the rectangular frame 21 is assembled with a fastener 30 as a fixing means D on the side end surface in the width direction.
The fastener 30 has a base end side of a metal rod 31 having a predetermined length fixed to a rotating plate 32, and a distal end side thereof is bent into a semicircular arc shape having a curvature substantially equal to the outer diameter of the handrail rod 6, This is part 33.
[0013]
A pin 34 serving as a rotation shaft is provided on the rear surface side of the rotation plate 32, and the pin 34 is loosely fitted in a long hole 35 provided on the side surface of the rectangular frame 21 in a state of being removed. .
Further, a hook-shaped clasp 36 that elastically clamps the vicinity of the tip of the metal bar 31 is attached to the side surface of the rectangular frame 21.
[0014]
For the bridge girder unit A, for example, a plurality of types having different lengths every 1 m are prepared.
On the other hand, if only one type of walking board unit B having a length of 1 m is prepared and placed, it can be shared by bridge girder units A having different lengths.
[0015]
Next, FIGS. 7 and 8 show an assembly structure when the inspection bridge is assembled using two bridge girder units A. FIG.
FIG. 7 is a plan view of the inspection bridge, and the walking board unit B group omits illustration of one half side in the width direction. FIG. 8 is a side view.
[0016]
A base plate 42 is bolted to one end of each bridge girder unit A using the bolt holes 7. Both base plates 42, 42 are for placing both ends of the patrol bridge on the construction ground.
Although not shown, insertion holes are provided at both ends of the base plate 42 for inserting anchor bolts or anchor rods embedded or driven into the ground.
[0017]
The two bridge girder units A, A can be assembled easily and quickly by connecting the bolts using the connecting plate 41 to the bridge girder portion of the inspection bridge.
On the left and right sides of the connecting plate 41, bolt holes are provided at a plurality of locations corresponding to the bolt hole 7 groups provided at both ends of the stringer 1.
The handrail E is attached to the assembled bridge girder as described above. Alternatively, it may be attached before the bridge girder units A and A are connected.
The butted portions of the two handrail rods 6 and 6 are connected together using the connection fitting 8.
[0018]
After finishing the assembly and erection of the bridge girder part, the walking board unit B is attached to each bridge girder unit A.
For this purpose, the walking board unit B is placed on the bridge girder unit A, and the connecting pins (not shown) are kept in the pin holes of the respective pair of pin insertion fittings 4a and 4b constituting each hinge portion C. It only has to be inserted.
In the case of the short and light bridge girder unit A, it is of course possible to assemble the walking bridge unit A in advance after assembling the walking board unit B to the bridge girder unit A.
[0019]
The bridge girder unit A, the walking board unit B, the handrail E, etc., as unit members constituting the patrol bridge are all made with a weight that can be easily transported by one or two people, and the connecting points of each member Are all connected with bolts.
Therefore, the above-described series of bridging operations can be performed easily and quickly with a small number of people without requiring heavy machinery such as a crane.
[0020]
This patrol bridge usually places each walking board unit B in a state where it is placed on the bridge girder unit A with the hinge part C as a rotation axis.
However, in areas where there is a lot of snow, the patrol bridge may be destroyed by the weight of snow that has fallen on the bridge.
Therefore, only in winter, when the patrol bridge is not used, each walking board unit B is rotated around the hinge part C and fixed in an upright state, as indicated by a virtual line in FIG. .
[0021]
For this purpose, the fastener 30 that is usually fixed to the side of the frame using the stopper 36 is removed from the stopper 36 and then rotated 180 degrees toward the handrail bar 6.
Then, the fastener 30 may be pulled up by the length of the long hole 35 and the hook portion 33 may be hooked on the handrail bar 6.
[0022]
In an area where the amount of snow is relatively small, even if the walking board unit B is placed down in the winter, the tread 22 is made in a net shape, so there is no risk of snow falling on it.
[0023]
There are multiple types of bridge girder units A with different lengths, so if they are combined in an appropriate combination, the length of the assembly will be within the limit of the design strength of the inspection bridge. Can be freely changed according to the situation of the construction site.
Then, taking into consideration the convenience of transportation to the site, the number of workers, etc., for example, the walking board unit B is transported to the construction site in a state where it is assembled in advance to the bridge girder unit A, or assembled on the site. The procedure of transportation and erection, such as attaching, can be chosen flexibly so that it can be performed most efficiently.
[0024]
In the above configuration, the object of the present invention can be achieved even when the detailed structure is appropriately changed.
For example, the tread 22 may be formed in a lattice shape in addition to the net shape. Further, the combined structure of the vertical girder material 1 and the horizontal girder material 2 may be appropriately determined according to the size of the bridge girder unit A so that it can be made lighter and stronger.
[0025]
【The invention's effect】
As apparent from the above description, the leap-type steel patrol bridge according to the present invention has excellent practical effects as listed below compared to the conventional ones, and is generally required for the bridge and maintenance thereof. Costs can be significantly reduced.
(A) Compared to Maruki Bridge, the service life and safety at the time of crossover are improved to a degree that is not comparable.
(B) Since the walking board unit is a jumping-up type so that the snow load hardly needs to be taken into consideration, it can be made much lighter than a conventional steel bridge.
(C) Coupled with the adoption of the split structure, it can be installed relatively easily and in a short time with only human power, even in mountainous areas where crane trucks cannot enter or in places with poor scaffolding.
(D) By achieving a significant weight reduction, it is possible to greatly reduce the cost of construction of the inspection bridge and the construction cost.
(E) The length of the patrol bridge can be changed freely according to the circumstances of the construction site.
(F) The walking board unit in which a net or a grid-like step board is stretched on the frame contributes to the prevention of snow accumulation as well as the weight of the patrol bridge.
[Brief description of the drawings]
FIG. 1 is a perspective view of a patrol bridge in a state where a walking board unit is flipped up, showing an embodiment of the present invention.
FIG. 2 is a plan view of the bridge girder unit.
FIG. 3 is a side view of the bridge girder unit with the handrail attached thereto.
4 is a side end view of FIG.
FIG. 5 is a plan view of the walking board unit.
FIG. 6 is a side end view of a part of the inspection bridge, illustrating the attachment state of the fixing means to the walking board unit and the operation thereof.
FIG. 7 is a plan view showing a patrol bridge connecting two bridge girder units with one half side of the walking board unit group cut away.
FIG. 8 is a side view of FIG. 7;
[Explanation of symbols]
A Bridge girder unit B Walking board unit C Hinge part D Fixing means E Handrail 1 Vertical girder material 2, 3 Horizontal girder material 4a, 4b Pin insertion metal fitting 5 Post 6 Handrail rod 7 Bolt hole 8 Connecting metal fitting 21 Rectangular frame 22 Tread plate 23 Reinforcement bone 30 Fasteners (fixing means)
31 Metal rod 32 Rotating plate 33 Hook part 34 Pin 35 Long hole 36 Clasp 41 Connecting plate 42 Base plate

Claims (6)

A bridge girder unit A in which a plurality of vertical girder members and cross girder members are connected in a rectangular frame shape,
A walking board unit B having a size that can be placed on top of the bridge girder unit A;
A hinge portion C for connecting the side end of the walking board unit B to the side end of the bridge girder unit A so as to be able to stand up and down;
A jump-up type steel patrol bridge comprising fixing means D for fixing the standing state. The jumping steel patrol bridge according to claim 1, wherein the walking board unit B has a configuration in which a net or a lattice-like tread is stretched on a rectangular frame. The fixing means D is pin-connected at the base end to the side end of the walking board unit B, and at the tip end is a hook portion that is engaged with a handrail E erected on the side end of the bridge girder unit A. The jumping-type steel inspection bridge according to claim 1, which is a fastener provided. The bridge girder unit A to which the walking board unit B is assembled is prepared in a plurality of types having different lengths, and by combining them in an appropriate combination, the bridge girder unit A becomes a patrol bridge of a required length. The jumping-type steel inspection bridge according to claim 1, which is configured as described above. The jumping-up steel patrol bridge according to claim 1, wherein a plurality of the walking board units B are assembled to each bridge girder unit A in tandem. The jumping steel patrol bridge according to claim 1, wherein the walking board unit B is detachably assembled to the bridge girder unit A.

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